Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 85: Accelerators and Instrumentation II

HK 85.5: Talk

Friday, March 20, 2009, 12:00–12:15, H-ZO 90

The Liquid Hydrogen Target of the Crystal-Barrel/TAPS-Experiment at ELSA — •Christian Hammann — Helmholtz-Institut für Strahlen- und Kernphysik, Nußallee 14-16, D-53115 Bonn

The Crystal-Barrel/TAPS-experiment at the electron-accelerator ELSA is a photoproduction experiment investigating the spectrum and the properties of hadrons. The experiment features an electromagnetic calorimeter with nearly 4π angular coverage. The setup is especially suited for the detection of multi-photon final states.

For measurements on the nucleon a liquid hydrogen/deuterium target is available. The target is build such that the amount of material around the target cell is minimized to avoid conversion of photons, the loss of low energy protons and the production of electromagnetic background.

As the center of the Crystal Barrel detector is only accessible horizontally along the beam axis the target must have a rather long horizontal support pipe. This required the usage of two liquid hydrogen systems connected by a heat exchanger. An advantage for the operation with liquid deuterium is that only the smaller gas system needs to be filled with deuterium.

In this talk the liquid hydrogen target which was successfully used in several beamtimes will be presented.

Supported by the Deutsche Forschungsgemeinschaft (SFB/TR16).